Conrad, who leads these audacious medical efforts, previously cofounded the National Genetics Institute in 1991. As chief scientist there, he developed a new way to test for HIV and other viruses in blood-plasma donations that was much faster and cheaper than previous testing procedures.

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Arthur Levinson is tackling human longevity as CEO of Calico.

Calico is a biotech company focused on figuring out how to fight aging and extend human life.

Although it's a research and development lab similar to Verily, it's scope is even more broad (looking at longevity more generally versus specific diseases). It recently formed a partnership with genealogy company Ancestry which will let it use the company's DNA data to find traits that lead to longer live spans.

Before coming to Google, Levinson ran drug company Genentech for more than ten years. He's worked on more than 80 scientific articles and been awarded 11 patents.

That Sidewalk launched its first initiative there isn't a surprise, because before joining Alphabet, Doctoroff served as CEO of Bloomberg and deputy mayor of economic development and rebuilding for New York City.

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Astro Teller heads up X, where some of the company's wildest ambitions are born.

Flickr/Techcrunch

The company's secretive "moonshot" lab works on initiatives like Project Loon, which creates internet-beaming balloons and Project Wing, which is trying to build delivery drones.

Technically, Alphabet's self-driving cars still fall under X too, but those efforts will likely break out into a separate Alphabet subsidiary later this year.

Teller himself has worked at Google for the last five years, and previously founded five businesses.

Also, his real name is actually Eric. (We were disappointed too.)

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Bill Maris makes investing decisions as the head of GV (formerly called "Google Ventures")

Getty / Noam Galai

Maris founded the venture capital arm GV in 2009 and the division has so far poured money into company's like Uber, ecommerce company Jet, and Impossible Foods, which makes plant-based versions of animal products like meat and cheese.

Although Capital is its own Alphabet subsidiary, it's linked more closely to Google than GV is.

"We identify where we can make the biggest difference for any given company, then we connect them with the right expert advisors within Google," the company writes in its mission statement.

Before founding Google Capital, Lawee led Google's mergers and acquisitions team for five years, after being the VP of marketing at the search giant for several years before that. All told, he's been at the company more than 10 years.

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Craig Barratt runs Alphabet's Access and Energy division, which is best known for its super-fast internet service, Fiber.